154 lines
3.3 KiB
C
154 lines
3.3 KiB
C
|
/** -*- linux-c -*- ***********************************************************
|
||
|
|
* Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets
|
||
|
|
*
|
||
|
|
* PPPoX --- Generic PPP encapsulation socket family
|
||
|
|
* PPPoE --- PPP over Ethernet (RFC 2516)
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* Version: 0.5.2
|
||
|
|
*
|
||
|
|
* Author: Michal Ostrowski <mostrows@speakeasy.net>
|
||
|
|
*
|
||
|
|
* 051000 : Initialization cleanup
|
||
|
|
*
|
||
|
|
* License:
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public License
|
||
|
|
* as published by the Free Software Foundation; either version
|
||
|
|
* 2 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/string.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/errno.h>
|
||
|
|
#include <linux/netdevice.h>
|
||
|
|
#include <linux/net.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/if_pppox.h>
|
||
|
|
#include <linux/ppp_defs.h>
|
||
|
|
#include <linux/if_ppp.h>
|
||
|
|
#include <linux/ppp_channel.h>
|
||
|
|
|
||
|
|
#include <net/sock.h>
|
||
|
|
|
||
|
|
#include <asm/uaccess.h>
|
||
|
|
|
||
|
|
static struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
|
||
|
|
|
||
|
|
int register_pppox_proto(int proto_num, struct pppox_proto *pp)
|
||
|
|
{
|
||
|
|
if (proto_num < 0 || proto_num > PX_MAX_PROTO)
|
||
|
|
return -EINVAL;
|
||
|
|
if (pppox_protos[proto_num])
|
||
|
|
return -EALREADY;
|
||
|
|
pppox_protos[proto_num] = pp;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void unregister_pppox_proto(int proto_num)
|
||
|
|
{
|
||
|
|
if (proto_num >= 0 && proto_num <= PX_MAX_PROTO)
|
||
|
|
pppox_protos[proto_num] = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
void pppox_unbind_sock(struct sock *sk)
|
||
|
|
{
|
||
|
|
/* Clear connection to ppp device, if attached. */
|
||
|
|
|
||
|
|
if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE)) {
|
||
|
|
ppp_unregister_channel(&pppox_sk(sk)->chan);
|
||
|
|
sk->sk_state = PPPOX_DEAD;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(register_pppox_proto);
|
||
|
|
EXPORT_SYMBOL(unregister_pppox_proto);
|
||
|
|
EXPORT_SYMBOL(pppox_unbind_sock);
|
||
|
|
|
||
|
|
static int pppox_ioctl(struct socket* sock, unsigned int cmd,
|
||
|
|
unsigned long arg)
|
||
|
|
{
|
||
|
|
struct sock *sk = sock->sk;
|
||
|
|
struct pppox_sock *po = pppox_sk(sk);
|
||
|
|
int rc = 0;
|
||
|
|
|
||
|
|
lock_sock(sk);
|
||
|
|
|
||
|
|
switch (cmd) {
|
||
|
|
case PPPIOCGCHAN: {
|
||
|
|
int index;
|
||
|
|
rc = -ENOTCONN;
|
||
|
|
if (!(sk->sk_state & PPPOX_CONNECTED))
|
||
|
|
break;
|
||
|
|
|
||
|
|
rc = -EINVAL;
|
||
|
|
index = ppp_channel_index(&po->chan);
|
||
|
|
if (put_user(index , (int __user *) arg))
|
||
|
|
break;
|
||
|
|
|
||
|
|
rc = 0;
|
||
|
|
sk->sk_state |= PPPOX_BOUND;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
default:
|
||
|
|
if (pppox_protos[sk->sk_protocol]->ioctl)
|
||
|
|
rc = pppox_protos[sk->sk_protocol]->ioctl(sock, cmd,
|
||
|
|
arg);
|
||
|
|
|
||
|
|
break;
|
||
|
|
};
|
||
|
|
|
||
|
|
release_sock(sk);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static int pppox_create(struct socket *sock, int protocol)
|
||
|
|
{
|
||
|
|
int rc = -EPROTOTYPE;
|
||
|
|
|
||
|
|
if (protocol < 0 || protocol > PX_MAX_PROTO)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
rc = -EPROTONOSUPPORT;
|
||
|
|
if (!pppox_protos[protocol] ||
|
||
|
|
!try_module_get(pppox_protos[protocol]->owner))
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
rc = pppox_protos[protocol]->create(sock);
|
||
|
|
if (!rc) {
|
||
|
|
/* We get to set the ioctl handler. */
|
||
|
|
/* For everything else, pppox is just a shell. */
|
||
|
|
sock->ops->ioctl = pppox_ioctl;
|
||
|
|
}
|
||
|
|
module_put(pppox_protos[protocol]->owner);
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct net_proto_family pppox_proto_family = {
|
||
|
|
.family = PF_PPPOX,
|
||
|
|
.create = pppox_create,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init pppox_init(void)
|
||
|
|
{
|
||
|
|
return sock_register(&pppox_proto_family);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit pppox_exit(void)
|
||
|
|
{
|
||
|
|
sock_unregister(PF_PPPOX);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(pppox_init);
|
||
|
|
module_exit(pppox_exit);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
|
||
|
|
MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
|
||
|
|
MODULE_LICENSE("GPL");
|